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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9e475461ad371ac42112ce0a73eec9ad414601da1f5c527e6b33804721d7f5ed' 
  AND token = 'lUyOIS5JRNIf/t0o/H+yWz4+ni4LQsXGnOvKFU+MI6U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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