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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a3e7ca0042a9622e246c03fae1e9c400a9ccb81ff073f9e51471f335f5cc336c' 
  AND token = 'cmGtsSzgKFZto3rhTz79RyNYKawRwHP6Atvg1yPXexo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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