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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31568fadc81462d96ae91ab1c1480d443637e27cb4d6dbdbff16fb7cda6d8e6b' 
  AND token = 'Rs9oamwZEM6nX++Wbej83nLar2E3NJ92Fn9uDAAVjkk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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