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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'eed63545012e29c0ceb30def555d47260cd5c739086eaa1418fd56ff4fb29926' 
  AND token = 'SDo8Unn1CagWaPuUnmGSLHm5roPpaD9JvTykfBdtlXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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