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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfcbac3a67fe60e556910840ecc0d9f5a2478ee1080d929d68ac8b340e25ccda' 
  AND token = 'BrjfkkgyOzW1ZcDIDf02G8XKfBqe7+yR/4sej6+8z5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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