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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ea024e9dbd34f3da9ad7d51188576f96d3e174a6585e5fadc4991cab6ce50ffc' 
  AND token = '7mjSr51Ew+ygu1FJfPFI7BP5cttMGm89GQ0DUUNh63w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00092

JSON explain

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