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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8aba0b137b5ea839c72eaf2c289e337666dd4f3c3892502007a72a2238e28b39' 
  AND token = 'p8bEAd5xsRnfMPEZdB8MslfEyohFP/M6ZOISq59IzHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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