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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b44dbdcff58fecf3b02bfff1c594db245c2c8a7e169f426b53307d4b7c0eb5f4' 
  AND token = 'n3e/QcfKxT6YFQWzxKKeqi+yu95/aRB232nCUcnyNVw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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