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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9d80b8f34978579a7140d9b659df2326132e1400a527d38d8a2e191cc53bc161' 
  AND token = 'iwRYu5hTq+1Z035iBUdyxGxZB9E6ycvnkFsY/x1Yk1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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