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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e08651011c70cb74c6f7926a4c2d199ca136a0c2d62cc27e88dc709db93cc9c' 
  AND token = 'Y4NaJj0Z8rRgyRiF7xwsX2LnDo6RHo+1RGWd9JMG4ew=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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