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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '95dbffe2906a07d8266edec72d98af7631f2d6ab1abbacd94a103da778da9e54' 
  AND token = 'oiEagMClgk2S63h/iJItpLgwQzSAxP9Nx5WoAkl+mAA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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