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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e96c3e0f355e7e8b9596594b6789f57c5bbfd87bc8dc32a50ed00919564d2088' 
  AND token = 'sgeCdfAEwws9ACRDp9e15ZX4zjJ7K9HqG1wUyo8vTac=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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