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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13c4bc747c3b5e7d617fa4013d4ea7d785a0ebb997b3da8d8ea24c23b917b23d' 
  AND token = '47uGljErd7TeWt1kQ6DnaJDAqsi/k/41LqzL7IzLdPA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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