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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4020ec1acb8dffe965489dcecc9a77627fad83e9fa3eed175b6491783ec9096' 
  AND token = 'poBXAFdaJxU7V+2/cx7hyaIZ+hrw8hIcU7kg7TZdTvI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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