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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a4d92c4c3357e6cf5419be4cf4b193eadeb928f3b402ad28a6f0a12a3b45b7ac' 
  AND token = 'jo9VP9nZBsfDmFQipeh6PbfDK6gPH9XpDSN2g7mpSoo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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