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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '57ab3cdbb9d19a047615d6c7924b0c21505b07ad482a96cca147fc65142b614c' 
  AND token = 'HcrGS6JqdcEFlMPwMlbE1xNmivjnT/VYw15Sru//I+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}