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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '203e6c40399209667723d3ec31acf88f35d8cde1d8f6247675a26fbb40178c6e' 
  AND token = 'poD2vDgIQX5jQaHOb8JbApvOl/rQVd8rFl8s54c4KG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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