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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cfdc4a4e88b333cddcb3b69bf3ec3f9ac194a8224a1749ce096657d89a248c8b' 
  AND token = 'HOhkVw8cBRlFCUM26yXp5gMqOuKTJj6Cid1ezECD0Y4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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