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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c6b875a1101a2ca82b91d0b408f86a111450cdd544e7505ff9178838a8ef4f44' 
  AND token = 'gOgFGfFbAbeoJwddRfgr23K/n2aae1mzYIB9KIk5shw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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