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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5bd77b8cd9caa235cfa8d35e4f1aa40c09ce016a0ba98feaa73958b1dcc4cabd' 
  AND token = '6dQISJzphV4RMdLg4ew6ZWsH09jeGQ/ZgDHR5TdMy3k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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