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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1f69ef77a60a9b4fbf41d8f355460933f14a7de0c0877810bf6496b031cfca9' 
  AND token = 'SmDZ+hj1WioRafp7eR4rGyTK88l3eC4R9PcdgGNYBNE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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