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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '38600463538c72305a64253e4a3ccc7c77a2dba75d26643e3bc33cbf183d1365' 
  AND token = '3C+kG7lY3hVOv6ps1BHSHkqCbXBBdPij7Nfn+KQT3rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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