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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '27afe8256c44cae6d80bfb7a9cc33e18e0f3dfcc0a19353e20c8a4f6a9eda66a' 
  AND token = 'vAGjTdHgRvECDn+KnDO2xrQjyk5vj9B8cH36wLPI3Os=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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