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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c117fdce454bc5f20bea54dc35eccfcad754f65e3ef5eaee7234be56cf74cbb6' 
  AND token = 'y5O64oqvK3gh+I1wIurWDEAwT2hjk6kJxLK2oq5KoJ8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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