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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e6a26df2082a9b32bfa16a921fb5b081855b343963eaa640bcfd9c30d4913e7' 
  AND token = 'N2k8U9UclEngeN49krMsB+4MD/uH0qYQS0V2daqdJIk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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