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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0fb629e3d833fc4c2336c3105ffab1bd0c74815ac8432d8ba485d1ef90ca2d56' 
  AND token = '/58V5nqUICFo1HA59gZ36bNQUw9E3hYQHePqf0gLxSM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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