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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1426d7d10dcebb0b8628c3dc819c302ab562e0987cfe3c6ec20800548447c462' 
  AND token = 'ynDEoxaa843q+lbA2bmDurfLnV0LKy/70G6SZ7Nva2M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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