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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1e33d3229e22cfd8a54c1d32c24a83776d4ce1ecf063311a57a6043f813aabcf' 
  AND token = 'G50xrnq2vVKh0r9XJX1FLxURvt9cLhqPMUrXd7JwQg0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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