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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '629b8470a9262ab6df01b0c571c629adfde4e781d7b4738ed3bbea9a715448e0' 
  AND token = 'TfIvAnafyVXStK7gNMVytaJKMXuv6HAiEQv3ITDtFEM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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