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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a172c2763f8c9fdcf960c71183b3449e76990e607e82a1cd24d410c7d12ddd7b' 
  AND token = '3uq3PFEeUbhNsmrpXBZAj0hgYbpblHn2jxLAOnxaOjM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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