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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '23f0ed9de0fecda1ce6517ebb1582c12561daef45660a2fdffa6cb92b58e26cd' 
  AND token = 'adwMaZAtNgIJJvHsQSrp+iRMjzqV4LJrsVztTZymDiw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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