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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9efd159f062ce44b9334e19e6dc95c80787938b80cc8ba1c2d12baa3845bb6d5' 
  AND token = '6bquV9O0kE99/HURWAxg5Akb7Q+uFewI9tpYNshMKdg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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