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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09c4d9c5e95afd57ba91a91b42d2a9eeda261d2b736abcec13f7ca16c9b2bb6b' 
  AND token = '+VMO5nOh7r6SEAii6ON2fEEKWLl1LTdcysR+p2N6AUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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