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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f0f0854b82fed386aa8f0ab8febdbfb8220d05f235c3232a69158e7ae9dfa7a' 
  AND token = '0NrnnLo/lsLsqDbQg+iOMt9eWOLwpqbkouS7PgEtcFc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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