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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36bce00f9942cb35e8216b4e9a3d0e7517cacfbea6414cd0f4fb3ad7ee2c15db' 
  AND token = '50Kb04GS8cXsLK+RZspsRwQp4eLxeJnn860nHnstHF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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