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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d98e3db236781a72b3ce2ccd1c7fd3748ef60a26ab15a28d68522e201c1a40d' 
  AND token = 'FF470AOc0p3mGphtNkoQC9FxO5GoknJibh9+TG/yTh8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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