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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e9ecaa32415eb4b36eb1a9edd469fd454a0db35e2935f6bb97d24909f668ee9f' 
  AND token = 'w95S7LQO3Skvl611dlWaUIYFzs0fL2wH2NmOoW2upeE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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