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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2a93a5788866af08abc36cf24262442b56f560e1275634857ce3ee53deaf9c19' 
  AND token = '/Pof+x/6e2sReZ6YPiJvNHx4ibHjs5jauO6fkoD3NVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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