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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91f1d77c62e035aba103973faf1013ec05322c68b04fdffaf94e719d85236d1f' 
  AND token = 'UMn9A8pi15FSl8VkNfvwLeRhAYfxHpR7N9VqAnTHqoA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00107

JSON explain

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