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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eb174f9bbd58e2fcd44d7be870f109a3881a29f3aaa740e4f1d975276ff919c1' 
  AND token = 'LMgaG5Jd7A1t1f8mlpwrcHkYj13duyoukb3Nyc8AJnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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