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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b542f4c3b454a1291392c0ee98594547257ac3bf2f25820f2b5775ac45584852' 
  AND token = 'mTcXGTmTKXpWcF+nStxrBDuNnCTPic9Bdqf3KKwaloE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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