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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '24bf2819bd206c2592c9a1d8c627793543932de86b4712644e09b29c84e9b989' 
  AND token = 'MyPr/XnERhpr3/zwtK1Rp7WtHbqZMMFE9+V/1htcEvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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