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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56cddcaa10e7886ab3f13d39f304e553ec672ca493f7abbfc764940d13aecdb6' 
  AND token = '+sxs3xka1TfWYMlARHgBzDXffzzY4kPsAdwtLAcNXLs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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