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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e89428f6e55914770cc2ead1ff8c3647d8d96eacd5dd55f274fd25d19286b9da' 
  AND token = '5BrF6NXUtIDfcWeXcXRwLgUuTcz9WKpGYyMDUSv2pl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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