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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6ef6adba809d3dcd09c5a5924ec0d5f4d8c0de18b0278e9c33922c5d37a2289f' 
  AND token = 'A8fALguZUjng6ARL9p7cLjcw75e3nPVJCsdG06rlhZA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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