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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc7878b95adbadb4eb96bf530a33b767156f0e6fa4ded98360dab012b8a1e664' 
  AND token = 'V5Crxj6Qa4Av7Dvm80DFVLWPBHaN1Iw8DySflL3a6iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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