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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '69566cd5a14923b7ded5b0bc3c6cb8703c8caef2b1b7f786bf1cf238678eec96' 
  AND token = 'cXRY+ABZE7ipEerYLkVMeEigRUDcgSChcd/a93wDVSs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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