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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '49cc0ba02ead2e5f00bc8bcfb4c257e4f9472fb6d3bacf8c7d955dfdc2445797' 
  AND token = 'TSaejQ44qMeBu/DJR5K3JLjRR8OakxP9Hfyc9dPQEFU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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