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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5596e0df6975b4515784f3a5f6e14e906471bc6df34d80aae05c6c9eee8495a0' 
  AND token = 'cbWXanMYq7uLFVh5OGSwPyRhNHeuWplzWiAJpQi35Fc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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