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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8a340d8e28489b64a53042f0e99e173d39f5d5d10a7121d8fef472b6a5712de6' 
  AND token = 'o0w0kZg0svWEks4IPE5uwj7gNaUqi69G9WBhzC/T8tA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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