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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ecd68e7e70a46ac03f2a001c84b77b36d16e4a3bbfa8842ce2adb72086a484e2' 
  AND token = '8bLh8aZLvVSKtp9DnccNtd0v7Wmf0Wkf3tEKSWDokP4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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