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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31114e956b871f2b7b5bcddf0c7ddf771d3c1167850148843cf2fea3946fdd8b' 
  AND token = '5GPW2WqM0J4Grl/zbknBiTwlBUJF/yRyjJ9aYbfPar4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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