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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd875120a0c49a2078fc0ea55583d48d6fdf0c6cbe76613b0e730fde1e679da68' 
  AND token = 'Ckb616kfllzqQkLf/cwBZBhJ8zQd0RKsSlIAIutIhZs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00386

JSON explain

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