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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a52a3972f8a938fb8163796ae1bc899fafe52c416fc7e6f70639367f5f8492c3' 
  AND token = '8QCn4ZxBg59L5WgE1G5UXZ4Fdz8Dfz5MuOTGTvBRwoM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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