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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4b1116345a21f767dd3eba17e1efd4c215c93252759cfd02fedd8cc4bfc861ad' 
  AND token = 'k6wmUajfiA7/Y96PqJIbr/6r3JcioTWzOOKsT9kywBg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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