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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb525627b6fd8b1b95f5f05010b45d4c783a82589eb7c7b235ff8ad199cf88ac' 
  AND token = 'mnYnU4bIexMxhILaBLfsEkV2CG3iSpDhDJ4OsLjAdro=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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