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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8d5d85e79773aea4d478ccca6275396d68dcd67229b07bf84d74b3b31c9ffd5' 
  AND token = 'j47T0aTt/6m9LNeY61D5nUxMPeFePZyBho8HslcKHic=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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