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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2552c8075e209e1993cfc0de26fb8ce0d73bc809d95610d09951eb95d7cfe2a5' 
  AND token = '9iil8gPoOe7pKREzidRZ2DlJ0zhilVJRQVjvw1SnFcM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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