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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'db3ef9b298a630c7f73a3a621d776a5899a924a793de524053a9c9589c3f80e7' 
  AND token = 'Yni8SvmHtRyVJ1cQ/Fd1GCXF75A5vu74S2cU35iIxtM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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