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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb90ff62e3c955ebbc0ca7df7220a1ed603446bba5f7918f01b71eb428d8a37d' 
  AND token = 'k2LV81Vis/8KCD59hciuqhUeS5RmnxD1brNEZd6IgpY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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